Four Muslim youths living in Britain: Omar (Riz Ahmed), white Barry (Nigel Lindsay), Vai and Faisal are shooting jihad videos with a toy gun as props, and dedicating themselves to jihad is their fanatical dream. Tired of Barina's nonsense theory that Barina ate phone cards to avoid being tracked, Omar studied with Wayi at the Muslim guerrilla training camp in Pakistan. Omar and Wai's hard training life soon came to an end because they hit their comrades by mistake. Barry, who stayed in Britain, looked for comrades and found Hassan, an Arab youth who questioned British politics in public, and developed the bomb with Faisal, who used the variable voice method to collect peroxides to make bombs. Omar, who returned home, falsely claimed that he had been assigned to make a bomb and put others under his own control. Faisal was killed by a mistake, and the remaining four Muslim fighters set their sights on the London Marathon.